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  • Author or Editor: Victor A. Kahn x
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Mack A. Wilson and Victor A. Kahn

Four row covers (clear and white slitted), spunbonded polyester, and VisPore were used on `Atlantic' potato cultivar at Charleston, Missouri. Row covers were installed on March 6, 1991 and removed on May 5, 1991. No significant differences were observed with orthoganal comparisons on grade A, B, and total number of potatoes among row covers. Total yields were higher with row covers and the data was significant. Potato plant heights were greater with row covers and the data was significantly different when the control was compared with row covers.

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Mack A. Wilson and Victor A. Kahn

The influence of VisPore row cover and four synthetic mulches on the growth and yield of watermelons were studied. Row cover and synthetic mulch treatments consisted of VisPore row cover, IRT-76 (green), AL-0R (brown), clear and black polyethylene mulches. VisPore was used with a combination of' four mulches and two controls (VisPore alone and bare soil). Significant differences were observed by orthogonal comparison when no row cover (NRC) was compared to row cover (RC) on the number '000/acre of marketable `Crimson Sweet' watermelons. Total, marketable and percent marketable yields were significantly different when orthogonal comparison were performed on NRC vs. RC. Yields were greater when RC vs. NRC treatments were used on `Crimson Sweet' watermelons.

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Victor A. Kahn, C. Stevens, T. Mafolo, C. Bonsi, J.Y. Lu, E.G. Rhoden, M.A. Wilson, M.J.E. Brown, K. Kabwe and Y. Adeyeye

TU-82-155 and `Georgia-Jet' early maturing. `Carver II', TU-1892 and `Rojo-Blanco' late maturing sweetpotato, cultivars were evaluated in the field for 0.20 and 40% vine removal (VR) at 8 wk after transplanting. Parameters measured were: leaf area index (LAI) recovery, net assimilation rate, foliage crop growth rate (FCGR), storage roots crop growth rate (RCGR). alpha a (the mean relative growth rate in dry wt to the mean relative growth rate in leaf area over a time interval) or the partitioning of assimilates, total and marketable yield. A split. splitplot design was used and plants were sampled at 3 and 8 wk following VR. Except for TU-82-155 all cultivars showed significant LAI recovery above the control at 3 and 8 wk after vine removal when 20% of the vines were removed while at the 40% VR, only 'Georgia-Jet'. TU-1892 and 'Carver II' showed significant increases in LAI for the same periods. Net assimilation rate showed significant interactions while FCGR was not significantly affected by either 20 or 40 VR compared to the control at 3 or 8 wk after VR. RCGR was significantly affected by both levels of VR at 3 and 8 wk after VR and surplus assimilates (alpha a) showed significant interactions between cultivars and % VR. Told yield declined for all cultivars irrespective to maturity groups with the sharpest decrease being at the 20% VR. All cultivars except TU-82-155 showed a decrease in marketable yield, the increase in marketable yield of TU-82-155 was due to a lower non-marketable yield.